Bluetooth connection range is 10 meters and can easily be reduced by walls, furniture,
etc.)
2. The Letsfit app is closed on the phone. (This can occur automatically under certain
circumstances.)
To reconnect the watch to your smartphone, please kindly take the following steps:
1. Go to your smartphone system Settings, find the Letsfit app, and enable the Location and
Bluetooth.
2. Clear all running / background processes on your smartphone. Open the Letsfit app, go to the
"Settings" page, tap "IW2, IW3", and then the watch will reconnect to your smartphone and
update data. You can also restart your smartphone and Bluetooth, then re-pair the watch in the
app.
Blood Oxygen Level Measurement Accuracy
The Blood oxygen level will be affected by factors such as motion, watch placement on the wrist,
skin temperature and skin perfusion. These factors will cause fluctuations in blood oxygen
measurements.
For a single measurement on the watch, please wear the watch a finger-width below the wrist
bone, snug but comfortable on your wrist. When measuring, stay still and make sure your wrist is
flat with the watch facing up. If you are sitting, you can rest your arm on a table with the watch
facing up.
The smart watch blood oxygen sensor isn’t a medical device and won’t be able to diagnose or
monitor any medical conditions. If there is a problem with the measurement, we recommend you
consult your doctor.
